Fashion designer L'Wren Scott died as a result of suicide by hanging, the Chief Medical Examiner of New York has ruled.
Scott, who was the long-term partner of Rolling Stone Sir Mick Jagger, was found dead in her Manhattan apartment earlier this week.
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Diarmuid Martin said the institution had come through moments of real darkness and needed to avoid covering up or justifying what happened.
Poppy wreaths were laid by survivors and relatives of the dead at a 30th anniversary commemoration.
More than 200,000 visitors are expected to attend.